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Takeyasu, Masanori; Iida, Takao*; Tsujimoto, Tadashi*; Yamasaki, Keizo*
International Congress Series, 1276, p.289 - 290, 2004/00
The each concentration of Pb and Bi in rainwater was measured by a low background Ge detector. The concentration ofPb was a inverse relation with rainfall rate in some rainfall events, and the concentration ratio ofBi toPb was a weak inverse relation with rainfall rate in all rainfall events. These relations were the same as these obtained by the removal model of radon decay products from stratiform cloud.
Takeyasu, Masanori; Iida, Takao*; Tsujimoto, Tadashi*; Yamasaki, Keizo*
Proceedings of 6th International Conference on High Levels of Natural Radiation and Radon Areas, Program & Abstracts, (P-22), 85 Pages, 2004/00
The concentrations and its ratio of Pb-214 and Bi-214 in rainwater were measured by -ray spectrometry with a low background Ge detector, and the results were compared with the scavenging model of radon decay products from the atmosphere by precipitation. The each concentration of Pb-214 and Bi-214 in rainwater was constant and independent on precipitation rate for some precipitation events, and expressed with a power function of precipitation rate for the other events. The activity ratio of Bi-214 to Pb-214 was observed weak inverse correlated with precipitation rate. The measured ratio agreed fairly well with calculated one by the model.